Stand way clear of those shooting pistol ammo without a crimp. Less likely to get fragged when their gun explodes. Not actually comparing apples to apples here, but I had this inadvertantly happen to me before. I was loading 300 gn hard cast for a Ruger .44 mag that I liked to hunt with, or use as a back up for black bears. I was at the range, testing some loads that worked fine before, but I had changed lot #'s for both powder and primers. I fired about 8 or 9 rounds, and then I fired a round, all off of sand bags, when I knew something terribly went wrong. The recoil was awsome, and actually sent pain through my arm and elbow. Then I noticed that the crane was bent, and I had a heck of a time getting it apart to remove the remaining ammo. I (pre-intrenet days) called Ruger to see if anything could be done as far as repairing it, or was it totally FUBAR. I admitted to them what happend, and found that when I set my dies up, I didn't inspect the crimps well enough, One bullet had set back, and thus the Kaboom! They actually sent me a new gun, which amazed me, but the real crux of the story is this. If that gun had come apart, I could have just as well been holding a grenade. Big chunks of metal could have killed me instantly. A very stupid oversight on my part, but I've never gone without checkin the crimp again.
The bottom line here is, that the above posted pictures are exactly what could happen to you, if you don't crimp ammo, especially in a magazine fed hand gun.
You're "friends" who want to extend brass life, at the risk of their own and others lives, aren't being frugal, and in my opinion, are being especially selfish, as to the safety and well being of their shooting friends, standing next to them at the range.
J.